Do solar panels work at night or on cloudy days?

Before going solar, you may be wondering, "do solar panels work at night or on cloudy days?" It's a common question that most homeowners ask—and a fair one.

Solar panels don't work at night, but you can still use excess solar electricity when the sun goes down, depending on your system. On cloudy days, solar panels will still generate 10-25% of their normal power output.

If you choose to rely on solar panels for your home electricity use, it's important to understand how solar panels can be a reliable source of power during nighttime or severe weather when there is little to no available sunlight.

There's a long and a short answer to this question. We'll start with the short and then explain how solar energy storage works. We'll also discuss how much solar electricity production you can expect on cloudy days.

Yes, solar panels work on cloudy days—they just don't perform as well as they do under direct sunlight. On an overcast day, you can expect your panels to produce roughly 10—25% of their typical output, depending on how thick the cloud cover is.

That might sound discouraging, but here's some perspective: some of the best U.S. cities for solar are in cloudy and rainy climates. San Francisco, famous for its fog, consistently ranks among the top solar markets in the country. So does rainy Seattle. Those cities don't have abundant sunshine, but they do both have high electricity rates. And when the cost of electricity is higher, you're going to see bigger bill savings and a quicker break-even point from going solar.

In some cases, clouds can actually result in better panel performance than standard sunny weather. A cloud can reflect or even magnify sunlight, increasing the power output of your solar panels.

No. Solar panels require sunlight to generate electricity, so once the sun goes down, power production stops. No light, no power.

During the day, your panels absorb sunlight and generate direct current (DC) electricity. An inverter converts that DC power into the alternating current (AC) that your home's appliances run on. Any electricity your panels produce beyond what your home is using at that moment is sent back to the grid (which you'll be compensated for if you have net metering) or stored in a solar battery.

While solar panels themselves don't produce energy at night, there is a way to indirectly use your solar energy when the sun goes down.

Net metering: your grid credit system

Net metering is one of the biggest financial benefits of going solar, and it's also what makes nighttime power a non-issue for many solar homeowners.

Your panels typically generate more electricity than your home uses in a day, and, unless you have a battery, that excess energy is sent back to the grid. If your utility offers net metering, they credit you for that energy. So at night, when you have to draw power from the grid, those credits offset what you'd otherwise pay.

If your system is sized correctly, your daytime surplus can cover most or all of your nighttime usage, keeping your electric bill low, at zero, or potentially in the negatives with credits. You can think of the grid as a giant battery you never had to buy—if your utility offers a favorable net metering program.

The downside is that net metering availability varies by state, and policies have shifted in some markets in recent years—most notably in California, which overhauled its NEM 3.0 rules in 2023. If you're in a state with weak or no net metering, the math changes, and a home battery becomes a more important part of the conversation.

Home batteries: store solar energy for later

Solar batteries have come a long way. They're no longer just a niche add-on for off-grid homeowners, but are increasingly popular for homeowners who want more control over their energy, better backup protection during outages, or who live in areas where net metering isn't very generous.

A battery stores excess solar energy produced during the day so you can use it at night or during a grid outage, rather than sending it back to the utility. Popular options include the Tesla Powerwall and Enphase IQ Battery, though there are several strong options on the market depending on your needs and budget.

Adding a battery increases your upfront costs, but it also increases your energy independence—and in some states, there are still incentives available to offset the price.

Not as much as you might think. Solar performance does vary by region; for example, a home in Phoenix will generate more electricity per panel than one in Boston. But electricity rates, local incentives, and your household's energy use tend to have a bigger impact on your savings than raw sunshine hours.

Your installer will use your location's solar production ratio—a measure of how much electricity a system in your area generates relative to its size—to size your system. In cloudier regions, that usually just means installing a few more panels to hit your target output.

Most homeowners who go solar through EnergySage save between $37,000 and $154,000 over 25 years, and that range includes homeowners in all kinds of climates—not just the sunniest states.

Solar panels hit peak output on clear, cool days with the sun high in the sky, typically late morning to early afternoon. High temperatures can actually reduce efficiency slightly, which is why panels in mild, sunny climates often outperform those in intensely hot ones.

That said, a well-designed system accounts for your local conditions. Whether you're in the Pacific Northwest or the Sunbelt, the key is choosing the right panel efficiency, system size, and storage setup for your specific situation. That's exactly what a good solar installer—and a free EnergysSage Energy Advisor—can help you work with. Head to the EnergySage Solar Marketplace to receive and compare quotes from local, pre-screened installers in your area.